What can I take points from for Intermediate Strength? I only play NA so our max level is 50.

Edit: Since I play NA and I just advanced to Sword Taker I noticed we're missing skills like Infinity Cause so I'll edit my build accordingly. I also have an Sword Knight build (Here http://brokendisc.web.fc2.com/elswor....0.5.3.5.5.5.5) and it would be helpful to know what skills NA is missing so I can plan accordingly. I'm just having too much fun with Raven right now.